#include <M5StickC.h>
#include <Wire.h>

#define CARDKB_ADDR 0x5F

void setup() {
    M5.begin();
    Wire.begin(0, 26);
    M5.Lcd.setRotation(3);
    M5.Lcd.fillScreen(BLACK);
    M5.Lcd.setCursor(0, 0, 2);
    M5.Lcd.setTextColor(YELLOW);

    M5.Lcd.println("IIC Address: 0x5F\n");
    M5.Lcd.println(">>");
}

void loop() {
    Wire.requestFrom(CARDKB_ADDR, 1);
    while (Wire.available()) {
        char c = Wire.read();  // receive a byte as characterif
        if (c != 0) {
            M5.Lcd.printf("%c", c);
            Serial.println(c, HEX);
            Serial.println(char(c));
        }
    }
}
